当数据绑定到梯度停止时，找不到可视树元素

本文关键字：找不到 可视 元素 数据绑定 | 更新日期: 2023-09-27 18:18:01

尝试制作DataTemplate风格，它应该根据布尔值' isreporting '改变一对渐变停止的颜色。这是一个MVVM项目。

然而，当我向列表框绑定到的ObservableCollection(在视图模型中)添加项时，它出现了这个错误:

{"'为'System.Windows.Markup '提供值。StaticResourceHolder'抛出异常。'行号为153，行位为38。"}

无法找到名为'timeSlotColorValue'的资源。资源名区分大小写

样式/数据模板:

       <LinearGradientBrush x:Key="bordBackground" EndPoint="1,1" StartPoint="0,0">
            <GradientStop x:Name="timeSlotColorValue" Color="Lime" Offset="0" />
            <GradientStop Color="Transparent" Offset="0.2"/>
            <GradientStop Color="Transparent" Offset="0.8"/>
            <GradientStop x:Name="timeSlotColorValue2" Color="Lime" Offset="1"/>
       </LinearGradientBrush>
       <Style TargetType="ListBox" x:Key="timeSlotTemplate">
            <Setter Property="ItemTemplate">
                <Setter.Value>
                    <DataTemplate DataType="model:DVRTimeSlot">
                        <DataTemplate.Triggers>
                            <DataTrigger Binding="{Binding IsReported}" Value="true">
                                <Setter Property="GradientStop.Color" TargetName="{StaticResource timeSlotColorValue}" Value="Red" />
                                <Setter Property="GradientStop.Color" TargetName="{StaticResource timeSlotColorValue2}" Value="Red" />
                            </DataTrigger>
                        </DataTemplate.Triggers>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="50" />
                                <ColumnDefinition />
                            </Grid.ColumnDefinitions>
                            <TextBlock Text="{Binding TimeString}" Padding="2" FontSize="13" FontWeight="Black" >
                                <TextBlock.Background>
                                    <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0,1">
                                        <GradientStop Color="LightGray" Offset="0"/>
                                        <GradientStop Color="Azure" Offset="1"/>
                                    </LinearGradientBrush>
                                </TextBlock.Background>
                            </TextBlock>
                            <Border Grid.Column="1" Background="{StaticResource bordBackground}">
                                <Border.Resources>
                                    <Style TargetType="TextBlock">
                                        <Setter Property="TextAlignment" Value="Right" />
                                        <Setter Property="Padding" Value="5,0"/>
                                        <Setter Property="FontSize" Value="13"/>
                                        <Setter Property="FontWeight" Value="SemiBold" />
                                    </Style>
                                    <Style TargetType="Border">
                                        <Setter Property="Padding" Value="3" />
                                        <Setter Property="Margin" Value="-3,0,-3,0" />
                                        <Setter Property="MinWidth" Value="240"/>
                                    </Style>
                                </Border.Resources>
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition />
                                        <ColumnDefinition />
                                    </Grid.ColumnDefinitions>
                                <TextBlock Grid.Column="0" Text="{Binding Reason}" TextAlignment="Center"/>
                                </Grid>
                            </Border>
                        </Grid>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
        </Style>

这是我基于数据的模型:

    public class DVRTimeSlot
    {
        public DVRTimeSlot()
        {
        }
        public bool IsReported { get; set; }
        public string Reason { get; set; }
        public CallReportCategory Category { get; set; }
        public DateTime TimeValue { get; set; }
        public string TimeString
        {
            get { return TimeValue.Hour + ":" + TimeValue.Minute; }
        }
    }

有谁能解释一下吗，我走错路了吗?我用这篇文章作为指导:用触发器改变文本框的颜色，但在这种情况下似乎不起作用

当数据绑定到梯度停止时，找不到可视树元素

StaticResource扩展将查找您指定为参数的x:Key资源。在您发布的代码中，您只指定了x:Name

我完全重新考虑了我的方法，并通过为边框使用单独的样式来解决这个问题

            <Style TargetType="Border">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding Path=IsReported}" Value="True">
                        <Setter Property="Background" >
                            <Setter.Value>
                                <LinearGradientBrush EndPoint="1,1" StartPoint="0,0">
                                    <GradientStop Color="Red" Offset="0"/>
                                    <GradientStop Color="Transparent" Offset="0.2"/>
                                    <GradientStop Color="Transparent" Offset="0.8"/>
                                    <GradientStop Color="Red" Offset="1"/>
                                </LinearGradientBrush>
                            </Setter.Value>
                        </Setter>
                    </DataTrigger>
                    <DataTrigger Binding="{Binding Path=IsReported}" Value="False">
                        <Setter Property="Background" >
                            <Setter.Value>
                                <LinearGradientBrush EndPoint="1,1" StartPoint="0,0">
                                    <GradientStop Color="Lime" Offset="0"/>
                                    <GradientStop Color="Transparent" Offset="0.2"/>
                                    <GradientStop Color="Transparent" Offset="0.8"/>
                                    <GradientStop Color="Lime" Offset="1"/>
                                </LinearGradientBrush>
                            </Setter.Value>
                        </Setter>
                    </DataTrigger>
                </Style.Triggers>
                <Setter Property="Padding" Value="3" />
                <Setter Property="Margin" Value="-3,0,-3,0" />
                <Setter Property="MinWidth" Value="240"/>
            </Style>
        </Grid.Resources>
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